The short answer
Aftermarket wheels and suspension can be fitted on an Australian light vehicle when the combination still meets the tyre, rim, load, coverage and ground-clearance outcomes in the standards that apply to that vehicle, and when any change beyond a listed minor item follows VSB 14 Section LS and your state’s process. There is no national millimetre figure on this page, because the bulletin and the state sheets are where those figures live — and they attach to your vehicle, not to a vibe.
Why these parts sit in one hub
A wider wheel changes scrub radius and guard coverage. A lower spring changes lamp aim, bumper height and the chance of the tyre hitting the body. A spacer changes stud engagement. Inspectors walk around the car once. They do not care that you bought the wheels from one invoice and the springs from another. Plan them as a package.
The archived catalogue split “wheels-cat18” from “suspension-cat17”. Those URLs now 301 here. The planning article is the replacement.
Tyres and rims
Look up the tyre placard and the rim standards the vehicle was certified to. Load rating and speed symbol have to remain suitable for the GVM and use. The tyre has to fit the rim. The combination has to sit in the body so that it is covered as the in-service rules require. Plus-sizing is not automatically unlawful; it is automatically a geometry and coverage problem you have to solve on paper first.
We do not rank wheel brands and we do not repeat archive claims about which rim is “the most popular in Australia”. A heritage news URL about a named brand is rewritten as a fitment article, not a market-share story.
Springs, dampers and coilovers
Lowering and lifting are both modifications. Cutting a spring is the example the old shop itself used to warn against, and state agencies treat damaged or shortened springs as a safety defect. Replacement springs and dampers that keep the vehicle’s attitude and clearance inside the applicable standard may be listed as minor in some jurisdictions; adjustable coilovers, large ride-height changes and steering or arm replacements usually are not. Read VSB 14 LS and the state sheet. Then read legal lowering.
Gas shock absorbers that maintain original attitude appear on Victoria’s approved list. That sentence is Victoria’s, not a national rule. Confirm the equivalent line where you are registered.
Alignment, bars and braces
Sway bars, traction rods and strut braces show up on some approved lists if clearance and structure stay intact. Once you start welding chassis points or changing pick-up locations, you are in certified territory. Alignment after any height or wheel change is part of making the vehicle safe. It is not a cosmetic extra.
Spacers and studs
Wheel spacers change the load path and the length of thread still in the hub. If your state or the bulletin treats a given spacer arrangement as a modification — many do once thickness or stud count changes — treat it as one. Do not invent a “safe thickness” from memory.
Lifted four-wheel-drives
A 4WD lift is still a light-vehicle modification if the GVM is 4.5 tonnes or less. It affects brakes, steering, driveline angles and lighting aim as well as springs. The heritage article on lift kits is rewritten at its old path and linked from the blog. Use VSB 14 and the state 4WD information sheet; do not copy a social-media measurement.
Related reading
Check with your state regulator or engineer before you change height, offset or tyre size. This page does not certify a combination.
A measurement session that does not invent a legal drop
Park on level ground. Photograph each corner. Record the tyre size from the sidewall, the rim diameter and width, and the offset if it is marked. Photograph the tyre-to-guard relationship on full lock. Photograph the headlamps so you can re-aim later. None of those photographs is a certificate. All of them are what a signatory asks for when you say you want a different stance.
If you cannot name the current offset, you are not ready to order a new one. If you cannot say whether the intended tyre still covers inside the body, you are not ready to lower the spring that moves the body toward that tyre.
After the hoist
Alignment is part of the modification. So is lamp aim. So is a road test that is not a public-road experiment in a half-finished geometry. If a damper weeps, a spring seats badly, or a tyre marks a liner, that is a defect in waiting. Fix it before an inspector has to.
Keep the invoices that tie the parts to the VIN. If you later change only the wheels, you have a new combination — revisit the pack.
Where this hub sends you next
Legal lowering, aftermarket wheels and tyres, and the heritage lift-kit article at its original news path. Check with your state regulator or engineer before you change height or offset.